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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Narrative (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 17, 2022 USD ($) ft² | Jun. 30, 2022 USD ($) a ft² property apartment | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) a ft² property apartment | Jun. 30, 2021 USD ($) | Dec. 31, 2021 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Number of real estate properties | property |  | 78 |  | 78 |  |
Investment in unconsolidated real estate ventures |  | $ 458,840 |  | $ 458,840 |  | $ 435,506
Accounts receivable |  | $ 13,584 |  | $ 13,584 |  | 11,875
Rentable area (in square feet) | ft² |  | 13,639,287 |  | 13,639,287 |  |
Purchase price |  |  |  | $ 3,446 | $ 0 |
Real Estate Venture |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Accounts receivable |  | $ 2,800 |  | 2,800 |  | $ 2,500
Management Fees | Real Estate Venture |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Service and other revenue |  | 2,100 | $ 2,100 | 4,000 | 4,100 |
Leasing Commission Income | Real Estate Venture |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Service and other revenue |  | 800 | $ 600 | 1,100 | $ 1,900 |
Unconsolidated Real Estate Ventures |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investment in unconsolidated real estate ventures |  | $ 429,300 |  | $ 429,300 |  |
Unconsolidated Real Estate Ventures | Minimum |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  | 15.00% |  | 15.00% |  |
Unconsolidated Real Estate Ventures | Maximum |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  | 70.00% |  | 70.00% |  |
Unconsolidated Real Estate Ventures | Office properties |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Number of unconsolidated investments in Real Estate Ventures | property |  | 5 |  | 5 |  |
Rentable area (in square feet) | ft² |  | 9,100,000 |  | 9,100,000 |  |
Unconsolidated Real Estate Ventures | Other Liabilities |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investment in unconsolidated real estate ventures |  | $ 29,600 |  | $ 29,600 |  |
Unconsolidated Real Estate Ventures | Unconsolidated Properties |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Number of real estate properties | property |  | 10 |  | 10 |  |
Number of properties with negative investment balances | property |  | 1 |  | 1 |  |
Unconsolidated Real Estate Ventures | Land Held For Development |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Number of unconsolidated investments in Real Estate Ventures | property |  | 2 |  | 2 |  |
Area of land (in acres) | a |  | 1.4 |  | 1.4 |  |
Unconsolidated Real Estate Ventures | Land Under Active Development |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Number of unconsolidated investments in Real Estate Ventures | property |  | 1 |  | 1 |  |
Area of land (in acres) | a |  | 1.0 |  | 1.0 |  |
Unconsolidated Real Estate Ventures | Mixed Use Tower |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Number of unconsolidated investments in Real Estate Ventures | property |  | 1 |  | 1 |  |
Rentable area (in square feet) | ft² |  | 200,000 |  | 200,000 |  |
Number of apartment units (in units) | apartment |  | 250 |  | 250 |  |
Unconsolidated Real Estate Ventures | Residential Tower |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Number of unconsolidated investments in Real Estate Ventures | property |  | 1 |  | 1 |  |
Number of apartment units (in units) | apartment |  | 321 |  | 321 |  |
Cira Square REIT, LLC |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage | 20.00% |  |  |  |  |
Gross purchase price | $ 383,000 |  |  |  |  |
Purchase price | $ 28,600 |  |  |  |  |
Cira Square REIT, LLC | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Spread on variable rate | 3.50% |  |  |  |  |
Cira Square REIT, LLC | Secured Debt |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Debt instrument, face amount | $ 257,700 |  |  |  |  |
Cira Square REIT, LLC | Office properties |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Rentable area (in square feet) | ft² | 862,692 |  |  |  |  |

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